Hi Yvan,
I’ve been conducting tests with the 2D turbulent flat plate case, which, as mentioned, provides satisfactory results compared to experimental data using the same setup as for the vehicle (same reference magnitudes, same DDES turbulence model, etc.). I notice that the hybrid_blending_function field doesn’t exhibit noise near the wall, which does occur in the case of the vehicle (images attached). Consequently, I tried simulating the vehicle using k-omega SST (i.e., without DDES), and surprisingly, I have good results in the friction coefficient (but not in the total drag). I had already mentioned in another post (see here: Appropriate setting of an hybrid turbulence model and initialization of the almax variable) that I had this noise problem in the hybrid_blending_function field. Yvan, you had recommended consulting Jean-François about it. I understand that if I were to resolve this noise problem in that field, it might give me a good friction coefficient. Is it possible that this is happening because the vehicle mesh has 2:1 jumps in mesh size? (It was created in OpenFOAM, using snappyHexMesh) (see in images attached),or perhaps, regardless of the mesh, there is an undesired behavior in the switch between RANS and LES, which causes disturbances in the fields.
Thank you in advance for any assistance.
